Alas calls to her will cost her $1/minute to receive them.
So at the moment I am not sure how best to communicate. Possibly for me to text her (free for both of us) and for her to text me back from a friend's (local) phone

I seem to recall when I was on VF if I roamed in Oz, then the costs were the same as if I were in NZ. I guess one advantage of a global player versus a local provider. There isn't enough time for her to get a local SIM card else that might have been the best option.